Manufacture of cement

23.51
Manufacture of cement
This class includes:
- manufacture of clinkers and hydraulic cements, including Portland, aluminous cement, slag cement and superphosphate cements
This class excludes:
- manufacture of refractory mortars, concrete etc., see 23.20
- manufacture of ready-mixed and dry-mix concrete and mortars, see 23.63, 23.64
- manufacture of articles of cement, see 23.69
- manufacture of cements used in dentistry, see 32.50